Exserohilum monoceras （Drechsler） Leonard and Suggs is a potential biocontrol agent for the control of Echinochloa species. This fungus causes leaf blight in Echinochloa species, but does not damage rice. Phytotoxic...Exserohilum monoceras （Drechsler） Leonard and Suggs is a potential biocontrol agent for the control of Echinochloa species. This fungus causes leaf blight in Echinochloa species, but does not damage rice. Phytotoxicity of the fungal fermented broth was evaluated through the bioassay and the active ingredients were preliminarily isolated by using silica gel column chromatography （CC） in this study. The most active fraction 5-Ⅲ was obtained and analyzed by gas chromatography-mass spectrometry （GC-MS）. The results show that 5-Ⅲ consisted of many compounds, in which 36 compounds accounted for 94.24% of total peak area. Di-n-butyl phthalate （DBP） displayed the highest activity accounted for 9.24% of the total peak area, suggesting that DBP may be one of the main active compounds produced by E. monoceras.展开更多
【目的】各大棉区的公检数量增加迅速,全面覆盖了我国主要棉花主产区。分析自公证检验以来新疆棉区棉花纤维品质变化,了解我国主要棉区棉花纤维品质的整体状况及发展趋势,为育种及相关决策提供参考。【方法】以2006~2013年我国棉花纤维...【目的】各大棉区的公检数量增加迅速,全面覆盖了我国主要棉花主产区。分析自公证检验以来新疆棉区棉花纤维品质变化,了解我国主要棉区棉花纤维品质的整体状况及发展趋势,为育种及相关决策提供参考。【方法】以2006~2013年我国棉花纤维公证检验检测的纤维品质为研究对象,划分不同区域进行分析。【结果】随着国储政策的深入实施,八年来,我国棉花纤维长度、比强度整体呈现下降趋势,年均下降0.1 mm和0.16 c N/tex。新疆地方棉区纤维长度优于内地和新疆兵团棉区,年际间分别较二者高0.2~0.3 mm和0.3~0.6 mm,〉28 mm长度级范围内新疆地方棉区棉花所占比显著高于内地及兵团;在纤维比强度方面,全国平均、新疆地方与兵团年均下降0.16、0.28、0.32 c N/tex。近三年来强度中上水平（〉29 c N/tex）皮棉所占比例明显下降,表现为内地棉区占比较高,新疆地方棉区次之、兵团最低;在纤维整齐度方面,全国平均、新疆棉区总体呈现下降趋势,新疆地方棉花优于内地和兵团;在马克隆值方面,表现出A级所占比整体下滑、B级微升、C级逐年增加趋势。【结论】新疆棉区棉花主要纤维品质下降严重,应启动优质手采、机采棉新品种培育及推广。展开更多
基金the National Natural Science Foundation of China(30671381,30671381)Guangdong Provincial Natural Science Foundation of China(06300411)for the financial supports
文摘Exserohilum monoceras （Drechsler） Leonard and Suggs is a potential biocontrol agent for the control of Echinochloa species. This fungus causes leaf blight in Echinochloa species, but does not damage rice. Phytotoxicity of the fungal fermented broth was evaluated through the bioassay and the active ingredients were preliminarily isolated by using silica gel column chromatography （CC） in this study. The most active fraction 5-Ⅲ was obtained and analyzed by gas chromatography-mass spectrometry （GC-MS）. The results show that 5-Ⅲ consisted of many compounds, in which 36 compounds accounted for 94.24% of total peak area. Di-n-butyl phthalate （DBP） displayed the highest activity accounted for 9.24% of the total peak area, suggesting that DBP may be one of the main active compounds produced by E. monoceras.
文摘【目的】各大棉区的公检数量增加迅速,全面覆盖了我国主要棉花主产区。分析自公证检验以来新疆棉区棉花纤维品质变化,了解我国主要棉区棉花纤维品质的整体状况及发展趋势,为育种及相关决策提供参考。【方法】以2006~2013年我国棉花纤维公证检验检测的纤维品质为研究对象,划分不同区域进行分析。【结果】随着国储政策的深入实施,八年来,我国棉花纤维长度、比强度整体呈现下降趋势,年均下降0.1 mm和0.16 c N/tex。新疆地方棉区纤维长度优于内地和新疆兵团棉区,年际间分别较二者高0.2~0.3 mm和0.3~0.6 mm,〉28 mm长度级范围内新疆地方棉区棉花所占比显著高于内地及兵团;在纤维比强度方面,全国平均、新疆地方与兵团年均下降0.16、0.28、0.32 c N/tex。近三年来强度中上水平（〉29 c N/tex）皮棉所占比例明显下降,表现为内地棉区占比较高,新疆地方棉区次之、兵团最低;在纤维整齐度方面,全国平均、新疆棉区总体呈现下降趋势,新疆地方棉花优于内地和兵团;在马克隆值方面,表现出A级所占比整体下滑、B级微升、C级逐年增加趋势。【结论】新疆棉区棉花主要纤维品质下降严重,应启动优质手采、机采棉新品种培育及推广。
